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Incorrect Resin-to-Hardener Ratio
One of the most critical aspects of working with epoxy resin is getting the correct ratio of resin to hardener. If these components aren’t mixed in the right proportion, your resin won’t cure properly, leading to sticky, soft, or uneven surfaces.
How to Avoid:
- Follow the manufacturer’s instructions closely for the specific resin you’re using. Measure the resin and hardener carefully by volume, not weight, and always use separate cups for each component before mixing.
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Not Mixing Thoroughly
Improper mixing can cause areas of your resin project to remain uncured or to develop bubbles and streaks. When the resin and hardener are not mixed thoroughly, the chemical reaction needed to solidify won’t happen evenly.
How to Avoid:
- Mix your resin and hardener slowly and thoroughly for the recommended time, usually 3 to 5 minutes. Scrape the sides and bottom of your mixing container to ensure all the material is well combined.
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Working in the Wrong Environment
Temperature and humidity have a big impact on how your resin cures. If your workspace is too cold or too humid, it can lead to cloudy resin, sticky surfaces, or even delayed curing.
How to Avoid:
- Work in an environment that’s between 22°C and 30°C (72°F to 86°F) with low humidity. Avoid working in spaces that are too cold, hot, or damp, as this can affect the curing process.
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Pouring Too Thick
Pouring resin in layers that are too thick can cause the resin to overheat, resulting in bubbles, warping, or even cracking. Resin generates heat during the curing process, and thick pours trap too much heat inside.
How to Avoid:
- Pour your resin in thin layers (typically around 1/8 inch) and let each layer cure before adding another. If you need a thicker finish, use a deep-pour resin specifically designed for thick layers.
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Ignoring Safety Precautions
Epoxy resin can be hazardous if proper safety precautions aren’t followed. Direct skin contact, inhaling fumes, or working without proper ventilation can pose health risks.
How to Avoid:
- Always wear gloves, safety goggles, and a mask when working with epoxy resin. Ensure your workspace is well-ventilated, and avoid touching the resin with bare skin to prevent irritation or allergic reactions.
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Not Preventing Bubbles
Bubbles are one of the most common issues when working with epoxy resin. They can form during mixing or pouring and, if not properly addressed, will create a flawed surface.
How to Avoid:
- Mix your resin slowly to minimize bubbles and use a heat gun or torch to gently eliminate any bubbles that rise to the surface after pouring. You can also use a toothpick to pop smaller bubbles.
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Using the Wrong Type of Resin
Different resins are designed for different applications. Using the wrong type of resin can result in poor adhesion, a brittle finish, or discoloration over time.
How to Avoid:
- Choose the right epoxy resin for your specific project. For example, use casting resin for molds and deep-pour projects, and use a coating resin for surfaces like tables or countertops.
